TM 1-1520-218-10 3C-174 To enter the preset frequencies into the preset lists, access the Preset pages from the Communication page and laterally scroll to the Frequency Preset or Antijam Preset page. Refer to Figure 3C-126 and Table 3C-88. Access the Preset page by selecting the right line select key corresponding to the preset list item and assign a frequency and callsign to the preset list item. On the last page of the Antijam presets, select UPDT CDU AJ PRESETSto reload ARC-210 Antijam presets into the CDU to align radio and CDU preset lists. 1Figure 3C-126. Frequency and Antijam Preset Page Access and Usage Table 3C-88. Frequency and Antijam Preset Page Access and Usage Procedure NO. DESCRIPTION/FUNCTION 1 To access the presets page(s) and laterally scroll to the desired preset list page. 2 To access frequency preset page to define preset. 3 Select to insert into scan list. 4 Select callsign for preset frequency. 5 Select frequency and modulation for preset. 6 Select to tune to preset and return to communication page. (c) Maritime Channels. To usea maritime channel, enter M and the channel number. If the transmit frequency is to be the coast frequency associated with that channel, insert a C after the channel number. If C is not entered, the ship frequency will be used as the transmit frequency. To switch radio tuning between ship and coastal frequencies, enter an S (ship) or C (coast) into the CDU scratchpad and press the CHAN line select key. (d) V/UHF Scan Function. The FMS-800/ARC-210 provides an ability to continuously scan up to four communications frequencies for incoming signals. To enable the ARC-210 scan function, access the V/UHF control page and toggle the SCAN mode to ON. SCAN:will replace the callsign field of the communication page and the frequency field will display the scan frequency. The radio will progressively scan through each of the four scan frequencies entered on the V/UHF scan list page. When the radio detects a signal on one of the scan frequencies, RECV: will be displayed as long as a signal is detected. The frequency on which the signal was detected will be displayed in the frequency field. To lock onto that frequency, press the RECV line select key to toggle the channel to LOCKX. Repeat pressing this line select key to recall former locked scan frequencies. Up to three scanning frequencies can be recalled as locked frequencies. When the oldest locked frequency is displayed, press the same line select key again to return the radio to scan mode. To enter the frequencies into the scan list, access the preset pages from the Communication page and laterally scroll to the V/UHF Scan List page. Refer to Figure 3C-127 and Table 3C-89. The first scan frequency is the scan transmit frequency (i.e., the frequency on which the radio will transmit, if keyed while scanning). Access the Scan Preset page by